If you have names and addresses of interested possible members, send them personal invitations through the mail to your rush events. When I was rush chair, I bought generic party invitations (classy looking ones), filled in our rush info, and mailed them to PNMs. It was a personal touch. You could also email your rush info. Other possibilities for advertisements: a paid ad in the student newspaper, flyers in students areas just off campus (so you won't get in trouble), word-of-mouth, facebook ads, flyers in businesses/restaurants that students frequent a bit (ask the owner first).
You can hold rush events in members' apartments or in a coffee shop/popular student hang-out off campus. If you won't get in trouble from your University/College, hold your rush events in common areas on campus, such as in open areas of the student union, dining halls, etc. For example, you could have everybody meet by the couches on the first floor of the student center for info night. That way, you're on campus (which is convenient for everyone) and you won't get in trouble from your Student Life office for an unrecognized group reserving/using meeting rooms because you just casually grabbed some couches in an open area.
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